5. An investor took out a loan of 100,000 at 5% compounded quarterly, to be repaid over 13 years with quarterly payments of 2,626.90 at the end of each quarter. After 8 payments, the interest rate dropped to 3% compounded quarterly. The new quarterly payment dropped to 2,368.67. After 36 payments in total, the interest rate on the loan increased to 4% compounded quarterly. The investor decided to make an additional payment of X at the time of payment number 36. After the additional payment was made, the new quarterly payment was calculated to be 1713.41, payable for 4 more years. Determine x